Snellen chart
Test de Snellen
- Date
- 1862 · confidence high
- Place
- Utrecht, Netherlands
- Credited to
- Hermann Snellen
- Field
- Life & health
What it is
An optometric chart with letters of decreasing size used to measure visual acuity, developed by ophthalmologist Hermann Snellen from the acuity formula of his professor Franciscus Donders.
What it led to
- Worldwide standardization of visual acuity measurement
- Later scales such as the LogMAR chart